Motor generator suspension



Aug. 6, 1940. .E H, PlRON MOTOR GENERATOR SUSPENSION Filed Feb. 18, 1937 INVENTOR.

ATTORNEY,

Patented Aug, 6, 1940 MOTOR cisisnim'ron` sUsrENsIo Emil` H. Piron, New York, N. kY., Lassignor `to Transit Research Corporation, New York, N. Y.,

v a corporationof'New York j y u y y Application','Febmm-y'fia wsuserial Neizcgies c Y Liciaims.,worms-feci f l f- This invention relates "to a mounting4 for a motor vgeneratorunit such as isvused on trolley cars, the unit consisting of a motorgenerator set, anair compressor for brakes and general service anda blowerfor the car body ventillating system. The primaryfobject of the invention is to provide an improvedmounting vor suspension for this unit which will prevent the transmission to the car body of short wave vibrations.

Where vibrations of short wave length are to be damped it has been found most effective to provide substantial deflection in the mountings for the vibrating parts in order to materially alter these vibrations. It is also recognised that an elastic material such as rubber has the inherent qualityl of sound-damping more or less proportionate to its softness. It is, therefore, a specific object of this invention to providea frame for this entire unit and to support this' frameby springing elements of -elastic material such as rubber acting in shear. y

Another object is to provide elastic springs as above described, in an arrangement such that they will permit a rocking or floating of the mass of the unit to best advantage 'as regards the center of gravity of the unit and the torque reaction from the compressor which is of the reciprocating piston type. Conversely it is an object toarrangev the elements of the unit and their frame-in such manner that this "floating effect can be obtained to best advantage.`

A further object is tol provide elastic springing elements of improved type comprising semicylinders of rubber having semicylinders ofmetal surface bondedto the interior and exterior diametrical surfaces thereof, themetal semicylinders each being, in fact, slightly less ythan 180 each so that as two elements are placed about a load receiving shaft theelastic material may be compressedbefore insertion into a retainer of inverted cup shape provided therefor in the frame of the unit to be supported.

A further object is to provide a single removable unit comprising the motOI, generator, fan and compressor. y u

Other. objects and advantages will become hereinafter more fully apparent as reference is had to the accompanying drawing wherein my invention is illustrated by way of example and in which:

Fig, 1 is a top plan view of my improved support,

Fig. 2 is a section taken along the lines 3-3 I of Fig. 1,

Fig.v 3j is Ia sectiontl'1rough'oneA spring and springv mounting, andy f v s V 'i Fi`g.`4is a plan View of yone of the springs.

I indicates an electric motor in coaxial driving relationwith agenerator Zand a blower 3, 8 allA of which are rigidly lmounted on one leg 4 of an 'L-shapedvframe.- The frame-is suitably made up of parallelside rails 5 `and rails Sand 'Land intermediate straps or saddles. The endr rail I and a second rail' 9 fixed to at least one side 10 rail 5 constitute the short leg of `the L-shaped frame and supporta reciprocating compressor I0. Secured on the crankshaft II ofthe compressor yis a pulley Wheel I2. The shaft of the motorl I' has a pulley I3 which is connected to the pulley 15 I2 byfa belt I4.

The reciprocations` of 'the piston` in the compresser IIJ cause a periodic vibrationof its support and a potential source of noise, for the carbody' to which the frame, above described, is secured. 20

opposite endsof theaxis of thev crankshaft II. 30

The springs IB and I'IV are substantially equally spacedl from\ the axis A-A of the center of gravity ofthe entire supported mass. The axis of the springl is intersectedby the axis A-A.

The springs I5, I6, I1 and I8 are all of identi- 35 cal construction and consist of two halves or segments each com posedr of an -inner and an outer half shell I9 and 20 each surface bonded to a semicylinder of-elastic material 2-I therebetween. The shells I9 and 2U are each of slightly less than in circumference so that when 40 two springl segments are assembled substantial radial compression may be imposedon the elastic material 2|. The "segments are assembled on a `shaft 22 adapted to be secured to some portion 22 of a car body and, when compressed, are inserted into a cylindricaly cup shaped opening. Openings are provided, as indicated above, in the members 6 and 'I.

What is claimed is: 50

1. The combination of an L-shaped frame having a motor, generator and blower mounted in line thereon, a reciprocatory compressor offset therefrom and mounted on the short leg of the L, the'opposite endrails of said lframe having 55 a plurality of inverted cup shaped openings therein, and a cylindrical spring comprising segmental elastic elements and an axial load receiving shaft inserted in each of said openings.

2. The combination of an L-shaped frame having a motor, generator and blower mounted in line thereon, a reciprooatory compressor oset therefrom and mounted on the short leg of the L, the cross rail at the outer end of the long leg of the L having an inverted cup-shaped opening formed therein with the axis thereof crossing the line of the center of gravity of said blower, generator, motor and compressor, the cross rail at the opposite end of said long side extending along and forming a part of said short side, the last named cross rail having three inverted cup-shaped openingsformed therein with the axes of the first and second thereof being on opposite sides of said line and equally spaced therefrom and with the axis of the third thereof being on opposite sides of the axis of said compressor from said rst and second thereof.

3. The combination of ansL-shaped frame having a motor, generator and blower mounted in line thereon, a reeiprocatory compressor offset therefrom and mounted on the short leg of the L; the cross rail at the outer end of the long leg of the L having an inverted cup-shaped opening formed therein with the axis thereof crossing the line of the center of gravity of said blower, generator, motor and compressor, the cross rail at the opposite end of said long side extending along and forming a part of said short side, the last named cross rail having three inverted Cup-shaped openings formed therein with the axes of the first and second thereof being on opposite sides of said line and equally spaced therefrom and with the axis of the third thereof being on opposite sides of the axis of said compressor from said rst and second thereof, and elastic shear springs residing in each of said openings comprising semi-cylinders of rubber in constant, substantial compression with the walls of said opening and an axial shaft therethrough.

4. The combination of an L-shaped frame having a motor, generator and blower mounted in line thereon, a reoiprocatory compressor oiset therefrom and mounted on the short leg of the L, three springs means supporting the short leg of the L, the axes of the blower, motor and generator passing between the first and second of said three spring means, the axis of said comn pressor passing between the second and third thereof, and a fourth spring means supporting the long leg of the L, said fourth spring means residing laterally between said axes and said second spring means.

l EMIL H. PIRON. 

